Hi,
How to express the unit of an irregular period of time in the time
coordinate variable in CF-netCDF? For example, for two 4-day periods: a)
between 2007-01-01 and 2007-01-04; and b) between 2007-01-05 to 2007-01-08,
which of the followings are correct?
1. time(time)=1,2 unit = "P 4 day since 2007-01-01"
2. time(time)=1,2 unit = "P4D since 2007-01-01"
There are names for regular time periods, such as week and fortnight, in
udunits.dat. For irregular time period, such as 3 days 1 hours and 5
minutes, I am not sure if we should use ISO 8601 expression, "P1M3DT1H5M"
or something like "P 1 month 3 day 1 hour 5 minute" as unit.
Thanks.
Wenli
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